add form preview

app/javascript/submission_form/image_step.vue

@@ -37,6 +37,7 @@
     <FileDropzone
       :message="`${t('upload')} ${field.name || t('image')}${field.required ? '' : ` (${t('optional')})`}`"
       :submitter-slug="submitterSlug"
+      :dry-run="dryRun"
       :accept="'image/*'"
       @upload="onImageUpload"
     />
@@ -66,6 +67,11 @@ export default {
       required: false,
       default: true
     },
+    dryRun: {
+      type: Boolean,
+      required: false,
+      default: false
+    },
     submitterSlug: {
       type: String,
       required: true